Robin Wright plays Francis' wife, Claire Underwood, on the show and is now stepping into the lead role following Spacey's ousting.

"There wasn’t any hesitation,” Wright told ET of returning for a final season while at the Los Angeles season premiere of House of Cards on Monday night. "We wanted to close out this show the way it was always intended for the fans and equally important was we would have put over 600 people out of a job. So it was only fair to finish with the security they expected."

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The cast, including Constance Zimmer, Greg Kinnear, Patricia Clarkson, Boris McGiver, Michael Kelly and more, all attended the premiere. Wright -- who looked fierce at the premiere in a sheer black top with a black suit and heels -- told ET that the last day on set was emotional for everyone involved.

"It was bittersweet, lots of tears and nobody wanted to leave!” she said. "We hung out in the Oval Office until about 3 a.m., dancing." She added that there were “plenty” of beverages to help with the fun.